Cyclic phosphonate esters and their preparation

ABSTRACT

Polymers containing flame retardant amounts of addition products of alkylhalogen-free esters of (1a) phosphorus acids, (1b) carboxylic acids, or (1c) sulfonic acids and (2) a bicyclic phosphite (1-alkyl-4-phospha-3,5,8-trioxabicyclo-(2,2,2)-octane), said addition products having the following group;   WHERE R is lower alkyl C1-C4), preferably C1-C2, an hydroxyalkyl (C1-C4), preferably C2-C3; the addition products of (1a) or (1b) and (2); and preparation of the addition products by heating a mixture of (1a) or (1b) and (2) to an elevated temperature (e.g., 175*-300*C.).

United States Patent 91 Anderson et al.

[451 Jan. 29, 1974 1 CYCLIC PHOSPHONATE ESTERS AND THEIR PREPARATION [75] Inventors: James J. Anderson, Metuchen;

Vasco G. Camacho, Iselin; Robert E. Kinney, Lawrenceville, all of NJ.

[73] Assignee: Mobil Oil Corporation, New York,

[22] Filed: Nov. 15, 1971 [21] Appl. No.: 199,022

[52] US. Cl. 260/927 R, 260/45.8 R, 260/937,

Primary Examiner-Anton I-I. Sutto Attorney, Agent, or Firm-Andrew L. Gaboriault et al.

[5 7] ABSTRACT Polymers containing flame retardant amounts of addition products of alkylhalogen-free esters of (1a) phosphorus acids, (1b) carboxylic acids, or (1c) sulfonic acids and (2) a bicyclic phosphite (l-alkyl-4-phospha- 3,5,8-trioxabicyc1o-[2,2,2]-octane), said addition products having the following group;

I L/ R where is lower alkyl C -C preferably C -C an hydroxyalkyl Cl-C4 preferably C -C the addition products of (1a) or (lb) and (2); and preparation of the addition products by heating a mixture of (1a) or (1b) and (2) to an elevated temperature (e.g., 175- 300C).

14 Claims, No Drawings CYCLIC PHOSPHONATE ESTERS AND THEIR PREPARATION BACKGROUND OF THE INVENTION 1. Field of the Invention This invention is concerned with novel cyclic phosphonate esters having high thermal stability prepared by reacting alkyl-halogen-free esters with a bicyclic phosphite. It is also concerned with fire retardant polymer compositions containing them.

2. Description of the Prior Art With one exception, no literature references were found disclosing the chemical structure of the compounds of this invention or processes for preparing them. No references were found disclosing flame retardant compositions. U. S. Pat. No. 3,261,890 discloses a reaction between a triaryl phosphite and trialkyl phosphite or dialkyl alkyl phosphonate. The reaction disclosed is an ester interchange reaction and not the addition reaction of this invention. U. S. Pat. No. 2,852,549 discloses an ester interchange between two different trialkyl phosphates. Here again this reaction was not the addition reaction of this invention. U. S. Pat. No. 3,526,613 discloses a reaction between bicyclic phosphites and polycarboxylic acids. The patentees assign a structure to the products which appear to be similar to that of certain compounds of this invention. As is discussed hereinafter, however, the assigned structure does not appear to fit with analytical data on products of the patent prepared for comparative purposes. J. Chem. Soc. (C) 1970, p. 752-759 shows a reaction of methyl bicyclic phosphite with methyl toluene-p-sulfonate but has no disclosure of the utility of the addition product as a flame retardant.

SUMMARY OF THE INVENTION This invention provides compounds set forth by the formulae:

whereaisO,lor2;bis0,1or2;cis1,2,or3 anda b c is 3; R and R are the same or dissimilar and are alkyl, alkoxy, aryl, aryloxy, alkaryl, alkaryloxy, aralkyl, aryloxyalkoxy, or aralkoxy wherein the alkyl portion of these groups may contain hydroxyl but not halogen and the aryl portion may contain chlorine, bromine and hydroxyl groups; R is alkyl, hydroxyalkyl, or aryl; R is lower alkyl (C -C or hydroxyalkyl (C -C and wheredisO, 1 or 2;eis l,2or3;d+eis 3; R isas defined above; R is as defined above; R is alkyl, aryl, alkaryl, aralkyl, or aryloxyalkyl, wherein the aryl portion may contain bromine, chlorine or hydroxyl; and R is monovalent, divalent or tervalent alkyl, alkylene, aryl or arylene radical wherein the aryl or arylene radical may contain bromine, chlorine, alkyl or hydroxyl groups.

It also provides the process for preparing them and flame retardant polymer compositions containing flame retardant amounts of compounds of formulae or R CH36 (G) R S OCI-h /]PRs CHzO where R and R are same as defined above; and R is alkyl, aryl, alkylaryl or arylalkyl wherein the aryl portion may contain bromine, chlorine or hydroxyl.

DESCRIPTION OF SPECIFIC EMBODIMENTS Compounds used in this invention are prepared by heating esters of phosphorus, carboxylic or sulfonic acid with bicyclic phosphites at temperatures of about to 300C. An equivalent reaction ratio of ester/- phosphite of l/ 1 is preferred, although ratios of H3 to 3/1 may be used. Where the ratio differs from H l, the excess reactant, if any, may be removed from the product by distillation. The time of reaction can vary widely, from about 5 minutes to about 7 days or more, dependent on the reactants involved, whether a catalyst is used, and on the temperature employed. Reactants can be charged into the reaction vessel at once or added separately in a stepwise or continuous manner or added simultaneously in a stepwise or continuous manner. Mixed bicyclic phosphites or mixed esters can also be employed.

When the ester boils above 200C the reaction is normally conducted at atmospheric pressure. Pressures above atmospheric are advantageous when low boiling esters are employed. Pressures above atmospheric can also be employed with high boiling ester.

Catalysts can be employed to reduce reaction temperatures or reaction times, although the reaction can be conducted in the absence of catalyst. Effective catalysts that can be employed are halogens, alkyl halides, alkyl arylsulfonates, amines, phosphorus acids, metal salts and metal esters. Preferred catalysts are iodine, bromine, methyl toluene sulfonate, ethylene dibromide, triethylamine, ethanolamine, methyl acid phosphate, stannous oxalate, stannous octoate, stannous chloride, stannic chloride and dibutyl tin dilaurate. Combination of catalyst may also be used. Catalyst levels of 0.1 to 1.0 percent (based on total weight of reactants) are preferred, but higher or lower concentrations may be employed.

Compounds of this invention may be prepared in the presence of suitable solvents or dispersants; e.g., chlorinated aromatics such as dichlorobenzene. Similarly, compounds of invention may be used as a solvent or diluent in the preparation of other compounds of invention. Synthesis of compounds of invention within a given polymer during polymer formation or polymer processing is also anticipated.

The preferredbicyclic phosphites utilizable to prepare products of this invention are as follows:

ZC -CH20'P CH O where Z is lower alkyl (C -C It is contemplated that Z might also be alkaryl, aryl, aralkyl, haloaryl, aryloxyalkyl, haloaryloxyalkyl, hydroxyalkyl, and the like. Methyl and ethyl are preferred.

Other suitable bicyclic phosphites include structures such as:

Phosphonate derivatives of these phosphites according to the basic process (monomeric addition) of this invention could be monomeric or polymeric depending on the nature of the ester and the molar ratio of reactants.

Suitable esters of phosphonic acids have the structure:

Operative examples are those where R, R and R" are same as defined for the phosphonic acids hereinabove with the proviso that at least one R, R or R" group is methyl, ethyl, propyl, butyl or hydroxyethyl. Preferred reactants are those where at least one of the R, R or R group is methyl such as trimethyl, dimethyl phenyl, diphenyl methyl, methyl ethyl phenyl, and dimethyl 2,4-dibromophenyl phosphate.

Suitable esters of carboxylic acids have the structure:

Eliot].

where n is 1-3 and R is a monovalent radical such as methyl, ethyl, propyl, butyl, hexyl, phenyl, chlorophenyl, bromophenyl, dibromophenyl, tribromophenyl, hydroxyphenyl, naphthyl, tolyl, xylyl, benzyl, or phenethyl; or R is a divalent radical such as methylene, ethylene, hexylene, vinylene, ortho phenylene, meta phenylene, para phenylene, tetrachlorophenylene (o, m or p), or tetrabromophenylene (o, m or p); or R is a trivalent radical such as phenenyl. R may also be residues of other dicarboxylic acid esters such as R is defined as for the phosphonic acids above with the proviso that when n is one, R is methyl, ethyl or hydroxyethyl; similarly when n is 2 or 3 at least one R must be methyl, ethyl, propyl, butyl or hydroxyalkyl (C -C Preferred reactants include dimethyl terephthalate, dimethyl phthalate, dimethyl isophthalate, methyl o-bromobenzoate, methyl 2,4 -dibromobenzoate, dimethyl maleate, dimethyl fumarate, dimethyl tetrachloroterephthalate, bis(2-hydroxyethyl)terephthalate, bis(2-hydroxyethyl)polyethylene-terephthalate, dimethyl adipate, methyl salicylate, methyl 0- chlorobenzoate and methyl 2,4-dichlorobenzoate. Diesters of alkylene glycols such as ethylene glycol diacetate are also contemplated.

Suitable esters of sulfonic acid have the structure:

Operative examples are those where R is defined as for the phosphonic acids above and R is methyl, ethyl, propyl, butyl and hydroxyalkyl (C -C Preferred reactants are methyl and ethyl p-toluenesulfonates.

EXAMPLE I 33.2 g. (.205 mole) of bicyclic trimethylolpropane phosphite 1-ethyl-4-phospha-3 ,5,8-trioxabicyclo- [2,2,2]-octane), and 76.0 g. (.615 mole) of dimethyl methylphosphonate were charged into a 250 ml. flask equipped with stirrer, thermometer, heating mantle and condenser. The reaction was protected by blanket of nitrogen.

The mixture was heated rapidly to 188 at which time refluxing was observed. Heating at reflux temperature of 188-198C. was continued for 29.5 hours. Gas chromatographic analysis of the unstripped product showed the bicyclic phosphite had reacted completely. The product was stripped at 3 mm. to C.

56.5 g. of a colorless viscous liquid was obtained having an acid number of 12.1 mg. KOl-l/g. The distillate, 47.2 g., was identified as dimethyl methylphosphonate by gas chromatographic analysis. The product yield was near quantitative for a 1:1 molar ratio of reaction between the phosphonate and phosphite. Gas chromatographic analysis of the product showed no unreacted starting materials and twin peaks corresponding to two high boiling materials with very close elution times.

NMR analysis of product was consistent with the structure below:

' o omen, time o The twin peaks found by gas chromatographic analysis indicate the existence of cis-trans isomers.

EXAMPLE Ia 52.8 g. (0.325 mole) of bicyclic trimethylolpropane phosphite and 20.2 g. (0.163 mole) of dimethyl methylphosphonate were charged in a 200 ml. flask equipped with stirrer, condenser, thermometer and heating mantle. The reactor assembly was blanketed with nitrogen throughout the reaction. The mixture was heated to 90C. with stirring during which time the solid bicyclic phosphite melted and a homogeneous liquid was produced. The reaction mixture was heated for 25 minutes after which a temperature of 200C. was obtained and gentle reflux was noted. Heating was continued to maintain reflux for 2.5 hours during which time the pot temperature gradually increased at 230C. The mixture was heated at 230240C. for an additional 9.5 hours.

Essentially quantitative yield of a light yellow, glassy solid was obtained on cooling. Gas chromatographic analysis of the final product showed no dimethyl methylphosphonate, traces of unreacted bicyclic phosphite and traces of the two isomers of Example I. An acid number of 21.9 was obtained.

EXAMPLE lb 20.3 g. (0.125 mole) of bicyclic phosphite of Example l and 15.5 g. (0.125 mole) of dimethyl methylphosphonate were heated over a period of 8 hours at l89-240C. Both gas chromatographic analysis and iodine titration showed no unreacted phosphite. 2.4 g. of unreacted dimethyl methylphosphonate were recovered on stripping to 160C. at 3 mm. pressure. Gas chromatographic analysis and quantity of recovered dimethyl methylphosphonate showed the final product was a mixture containing approximately 85 percent of Example 1 and percent of Example la.

EXAMPLE lc 40.5 g. (0.25 mole) of bicyclic phosphite of Example I and 31.0 g. (0.25 mole) of trimethyl phosphite were heated to 133C. where steady reflux of trimethyl phosphite was observed. After heating under reflux for one hour, gas chromatographic analysis showed no reaction had occurred. Iodine catalyst, 0.14 g., was added. On continued heating, the reflux temperature rose to 175C. over a 1.7 hour period. GC analysis showed no reaction of bicyclic phosphite had occurred but 80-90 percent of the trimethyl phosphite had rearranged to dimethyl methylphosphonate.

Heating was continued for about 3 hours at 170-240C. The reaction product was essentially identical to the unstripped mixture of Example lb.

EXAMPLE ld 40.5 g. (0.25 mole) of bicyclic phosphite of Example I was charged into a reaction flask equipped with additional funnel, stirrer, reflux condenser and thermometer. The bicyclic phosphite was heated to 200C. Eight ml. (0.06 mole) of trimethyl phosphite was added in l-2 ml. portions over a two-hour period while main taining a reaction temperature of 1952l0C. GC analysis showed approximately 50 percent conversion of trimethyl phosphite to dimethyl methylphosphonate. After heating the mixture for 40 minutes at l98-212C., rearrangement of trimethyl phosphite to dimethyl methylphosphonate was essentially completed.

An additional 0.19 mole of trimethyl phosphite was added portionwise over a period of 6 hours at reaction temperatures of 200-225C. GC analysis of product mixtures at interval times showed rearrangement of trimethyl phosphite to dimethyl methylphosphonate occurred readily which in turn reacted with the bicyclic phosphite. After three hours additional aging at 6 200-240C., all of the bicyclic phosphite had reacted.

5.4 g. of dimethyl methylphosphonate was recovered on stripping to 150C. at l 1 mm. The final product was essentially identical to the product mixture of Example lb. Product acidity was 11.3 mg. KOl-l/g.

EXAMPLE le Dimethyl methylphosphonate was reacted with the bicyclic trimethylolethane phosphite, l-methyl-4- phospha-3 ,5 ,8-trioxabicyclo- 2,2,2 octane, according to Example la. A light yellow, semi-solid product was obtained having an acid number of 12.3 mg. KOl-l/g. GC analysis showed no unreacted phosphite or phosphonate.

EXAMPLE 1 f 49.8 g. (0.30 mole) of the bicyclic phosphite of Example l was heated with 24.9 g. (0.15 moles) of diethyl ethylphosphonate at 195200C. for 5 hours during which time little reaction took place. Iodine catalyst, 0.15 g., was added and the mixture was heated for an additional 7.5 hours during which time approximately 30 percent of the phosphite and phosphonate reacted. An additional 0.15 g. of iodine catalyst was added and heating was continued for 7 hours at 195-200C., 15 hours at 215220C. and 33.5 hours at 235-240C.

A neat colorless, semi-solid product was obtained having an acid number of 27.6 mg. KOH/ g. GC analysis showed all phosphonate reacted and approximately 10 percent unreacted bicyclic phosphite.

EXAMPLE lg 28.2 g. (.173 mole) of the bicyclic phosphite of Example I, 21.7 g. (.086 mole) of dibutyl butylphosphonate and 0.25 g. of ethanolamine catalyst were heated for 10.5 hours of l95206C. during which time approximately 10 percent reaction proceeded. Iodine catalyst, 0.25 g., was added and heating was continued for an additional 32 hours at 195-205C. GC analysis showed approximately percent of the phosphite and percent of the phosphonate had reacted. An acid number of 19.0 mg. KOl-l/gm. was found.

Heating was continued at l-205C. for 21 hours and an amber, viscous liquid was obtained. GC analysis showed only trace of bicyclic phosphite and no phosphonate remained in product. Product acidity of 78.2 mg. KOl-l/gm. was found.

EXAMPLE lb g. (0.9 mole) of trimethyl phosphate was heated with 48.6 g. (0.30 mole) bicyclic phosphite of Example I for 4.5 hours at 202208C. GC analysis showed all bicyclic phosphite had reacted.

After heating for an additional 2 hours at 206208C., the product was stripped to 172C. at 4 mm. pressure and 87.0 grams (0.54 mole) of trimethyl phosphate was recovered. The weight balance corresponds to a reaction ratio of approximately 1:1 between the phosphate and phosphite. The colorless, viscous liquid product contained no unreacted phosphite or phosphate and an acid number of 18.8 mg. KOH/g.

EXAMPLE li Example lb was repeated using 0.36 mole of bicyclic phosphite and 0.12 mole of trimethyl phosphate. After heating the mixture at 235240C. for 3 hours an amber, semi-solid product was obtained. Product acidity was 34.4 mg. KOH/g. GC analysis showed no unreacted phosphite or phosphate.

EXAMPLE Ij 59.7 (0.36 mole) of bicyclic phosphite of Example I and 21.7 g. (0.12 mole) of triethyl phosphate were heated for 6 hours at 230-240C. GC analysis showed no phosphate and about 8 percent unreacted phosphite. Product acidity was 33.2 mg. KOI-l/g.

The colorless, semi-solid product was produced after an additional hour at 235240C. having an acid number of 67.5 mg. KOH/ g. GC analysis of product showed no unreacted phosphite or phosphate.

EXAMPLE Ik 34.0 g. (0.21 mole) of the bicyclic phosphite of Example I and 52.8 g. (0.20 mole) of diphenyl methyl phosphate were heated to 215C. at which point a rapid exotherm to 300C. occurred over a two-minute period. The reaction was cooled to 235C. in four minutes. GC showed most of the phosphite and phosphate had reacted. After an additional hour at 2l0-235C., no unreacted phosphite and only a trace quantity of diphenyl methyl phosphate remained. Product acidity was 16.6 mg. KOH/g.

An additional hour at 235-238C. effected no significant change in product except the acid number increased to 27.1 mg. KOH/g. The final product was an amber, viscous liquid.

The structures of the compounds described in Examples I to Ik are set forth in Table l.

CHaO

" CH CH; CHzO \ll CHaCH: CHzO 0 H OCH:

PCHzCHgCHgCH] CHzO 2 C") CHJCHI (CHaOhP OCH:

CH: P

O (LHaCHzi CHQO 0 CHJCH: CH0 0 ll i [ocmc PCHa] I CHaO TABLE Continued CHQO 0 CHsCHz C112 EXAMPLE n 32.4 g. (0.2 mole) of bicyclic phosphite of Example I and 116.4 g. (0.6 mole) of dimethyl terephthalate were heated at 240270C. for 13 hours. GC analysis showed all phosphite had reacted. Excess dimethyl terephthalate was removed by stripping to 156C. at 5 mm. pressure.

The liquid product obtained solidified on cooling to a light tan solid having an acid number of 2.8 mg. KOH/ g. GC analysis showed no unreacted phosphite or terephthalate. Twin product peaks were observed corresponding to two high boiling cis-trans isomers.

A portion of the solid was recrystallized twice from ethanol. A white crystalline solid was obtained having a melting point of 196.5-l97.5C. Elemental phosphorus analysis showed 8.57 percent compared to 8.69 percent theory.

EXAMPLE Ila 0 0cm Et m onto 0 O O CH i JICHQO OCHKE I CHa O C{ CIhO I EXAMPLE lib The reaction of Ila was repeated using 0.5 percent (based on total weight) iodine catalyst. All phosphite and about percent of the terephthalate reacted in 14.5 hours at 235240C. The light yellow, glassy product had an acid number of 7.9 mg. KOH/g.

EXAMPLE Ilc 59.2 g. (0.4 mole) of bicyclic phosphite of Example Ie and 38.8 g. (0.2 mole) of dimethyl terephthalate were heated at 240270C. for about 6 hours and 2703l8C. for 2.3 hours. A dark yellow, brittle glass was obtained having an acid number of 20.8 mg. KOI-I/g. GC analysis showed no unreacted phosphite and trace of unreacted dimethyl terephthalate.

EXAMPLE Ild 49.4 g. (0.30 mole) of bicyclic phosphite of Example I and 29.1 g. (0.15 mole) of dimethyl o-phthalate were heated at 235-240C. for 34.5 hours. A golden brown, glassy solid was obtained having an acid number of 8.90 mg. KOH/g. GC analysis showed no unreacted ophthalate and about percent unreacted phosphite.

COMPARISON WITH EXAMPLE 6 OF U.S. PAT. NO. 3,526,613

The product of Example 6 of U. S. Pat. No. 3,526,613 was prepared as described therein for comparative performance with an analogous compound of this invention (cf. Example "(1). While the product characteristics as reported in the patent were confirmed, an acidity of 145 mg. KOI-I/g. was found. This high acid content indicates the reaction proceeded, in the main, by a different route than disclosed (=POH or =P(O)H is not titratable by alcoholic KOH). In addition, an analysis for the above group by iodine titration showed only 0.8 percent =P(O)I-I compared to 19.6 theory. These analyses indicate the cyclic phosphite ring was broken a second time by COOH to produce structure.

EXAMPLE IIe 49.4 g. (0.30 mole) of bicyclic phosphite of Example I and 21.6 g. (0.15 mole)of dimethyl maleate were heated for 18.5 hours at 200-240C. The dark brown solid contained no titratable acid. GC analysis showed no unreacted starting materials.

EXAMPLE II f 49.4 g. (0.30 mole) of bicyclic phosphite of Example I and 17.7 g. (0.15 mole) of dimethyl oxalate were heated at 195200C. for 15 hours. A brown, semisolid product was obtained having no titratable acidity. GC analysis showed all oxalate had reacted and about 25 percent unreacted phosphite.

EXAMPLE IIg 39.5 g. (0.12 mole) of bicyclic phosphite of Example I and 39.8 g. (0.06 mole) of dimethyl tetrachloroterephthalate were heated at 235-240C. for 10 hours. A black semi-solid was obtained having an acid number of 34.1 mg. KOI-I/g. GC analysis showed about 5 percent phosphite and 2 percent terephthalate remained unreacted.

EXAMPLE IIh 32.4 g. (0.2 mole) of the bicyclic phosphite of Example I and 25.5 g. (0.1 mole) of bis(2-hydroxyethyl)- terephthalate were heated at 194-244C. for 3.5 hours. The amber, semi-solid product contained no unreacted phosphite or terephthalate. Product acidity was 52.2 mg. KOl-I/g.

EXAMPLE IIi 48.6 g. (0.30 mole) of the bicyclic phosphite of Example I and 26.0 g. (0.15 mole) of dimethyl adipate were heated for 150 hours at '220270C. A brown, viscous, liquid product was obtained having an acid number of 41.6 mg. KOH/g. GC analysis of product showed no phosphite and only trace of adipate.

EXAMPLE Ilj 33.2 g. (0.2 mole) of the bicyclic phosphite of Example I and 43.0 g. (0.2 mole) of methyl o-bromobenzoate were heated at 235-240C. for 22 hours. GC analysis showed approximately percent of the benzoate ester and percent of the phosphite had reacted. Iodine catalyst, 0.075 g. was added and heating was continued for 7.5 hours at 235-240C. A golden, viscous, liquid product was obtained having an acid number of 16.4 mg. KOH/g. GC analysis of final product showed no unreacted phosphite and approximately 28 percent unreacted bromobenzoate.

EXAMPLE IIk 16.5 g. (0.10 mole) of the bicyclic phosphite of Example I and 21.5 g. (0.10 mole) of methyl pbromobenzoate were heated at 240250C. for 13 hours. A dark brown solid was obtained having an acid number of 10.6 mg. KOH/g. GC analysis showed approximately 97 percent phosphite and 67 percent methyl p-bromobenzoate had reacted.

EXAMPLE III 37.3 g. (0.23 mole) of the bicyclic phosphite of Example I and 39.3 (0.23 mole) of methyl 0- chlorobenzoate were heated at 235-260C. for 23.5 hours. An amber, viscous liquid was obtained having an acid number of 23.4 mg. KOH/g. GC analysis showed all bicyclic phosphite and approximately 68 percent methyl o-chlorobenzoate had reacted.

EXAMPLE IIm 34.5 g. (0.21 mole) of the bicyclic phosphite of Example l and 32.4 g. (0.21 mole) of methyl 0- hydroxybenzoate were heated at 230-260C. for 8.5 hours. An amber, solid product was obtained having an acid number of 1.4 mg. KOH/g. GC analysis showed only trace quantities of unreacted phosphite or methyl o-hydroxybenzoate. Infrared analysis showed the presence of a hydroxyl group in the product. The product was insoluble in water but soluble in 5 percent sodium hydroxide.

A portion of the crude solid was recrystallized from methanol. The white crystalline solid had a melting point of 173l75C.

TABLE II V O CILCHI 0 cmoll-@ llocm CHQO 0 II PCH:

CHzO

' CHQO O i CHI] 0 CH3 CHaO O ...[toc...t 40...] 2

CI-hO TABLE Ii (Continued) OCH; CH3CH3 (I? (I) CHJCHi CHQO (III) 03.1 dcnio-wdoom PCH,

0C 1 OHIO 0 O CH: CHzCHz 0 H O CH: CH:

"""J'E'CEJCIsCh, o o 011.011.615.515

0 CHJCHQ CHaO O CHzO 11k CHzO Cl 0 on on I I @liocmd CHzO O CHaO IIm EXAMPLE III 32.4 g. (0.20 mole) of bicyclic phosphite of Example I was charged into a reaction flask and heated to 96C and 0.06 moles of methyl p-toluene sulfonate was added over a 2.5 hour period. After aging for 30 minutes at 95l00C, about 30 percent of the sulfonate ester had reacted. The reaction temperature was raised to l45l50C and all of the sulfonate reacted in 30 minutes. An additional 0.14 mole of sulfonate was introduced portionwise over a 4.5 hour period at l45l50C.

After two hours aging at 150l55C, a light yellow, viscous, liquid product was obtained with an acidity of 16.7 mg KOl-l/g. GC analysis showed only traces of unreacted phosphite and sulfonate.

EXAMPLE llla 32.4 g. (0.20 mole) of bicyclic phosphite of Example I and 40.0 g (0.20 mole) of ethyl p-toluene sulfonate O CHaCH: CHzO was heated at ll0-l4lC for 7.5 hours during which time about 20 percent reaction had occurred as determined by GC analysis. After heating for 10.5 additional hours at l45l 60C, a light yellow, viscous, liquid product was obtained having an acid number of 16.7 mg KOl-l/g. GC analysis showed only trace of unreacted phosphite and about 10 percent unreacted sulfonate.

CHzO

ll cnp sozoomc /P omen,

CHzO IIIa POLYMERIC COMPOSITIONS The continuing eveolution of new or more stringent flammability standards covering organic polymers in the form of fibers, films, coatings, castings, moldings, etc. imposes ever increasing demands on performance characteristics of the flame retardants for the polymer. Nylon and polyethylene-terephthalate, for example,

are thermoformed into fibers, films, moldings, etc., at,

processing temperature of 250-300C and higher. One of the more desirable methods of incorporating the flame retardant into these polymers is direct blending into the molten polymer either prior to or during the thermoforming operation such as extrusion.

These blending operations normally subject the flame retardant (in the presence of the polymer) to temperature of 250-300C and higher for periods of fractional minutes to 30 minutes and longer. Obviously, the flame retardant must be thermally stable, in itself, and in contact with the polymer during this exposure. Conversely, no significant breakdown of the polymer caused by chemical interaction or thermal decomposition of the flame retardant should occur. It should be understood, however, that some chemical interactions between the flame retardant and polymer may be desirable in some cases.

High flame retardant efficacy is generally required to minimize loadings to preserve the mechanical properties of the unmodified polymer. Most flammability standards covering textile applications require excellent retention of flame resistance after 10-50 laundry or dry cleaning cycles. Retention of flame resistance of polymers incorporating nonreactive flame retardants normally requires hydrolytically stable, nonmigrating and insoluble additives.

A new series of organophosphorus compounds of this invention meet the stringent performance requirements above. Structures of these compounds are set forth in the Summary of the Invention. The surprising high thermal stability of these structures may be due to the fact that the phosphorus is combined by (a) P-C linkages and (b) R-llnkages.

P OGHzC\ The absence of H atoms on the beta carbon in the latter structure apparently prevents rapid dealkylation reactions to form P-OH and olefins. Dealkylation reactions normally occur rapidly at 200-250C when the beta carbon contains a hydrogen.

EXAMPLE IV The brittle blend was finely ground into a free flowing powder.

Polyester flame retardant compositions prepared are tabulated below:

, Blend Flame Remarks No. Retardant Agent lVa 8% la Blended for minutes at 290-3l8C. No evidence of decomposition as assessed by Color IV!) 24% la Hlcndcd for 5 minutes at 280-3 10C. No evidence of decomposition as assessed by color IVc 8% Ila Blended for 5 minutes at 300325C. No evidence of decomposition as assessed by color lVd 50% Ila Blended for 5 minutes at 3053l0C. No evidence of decomposition as assessed by color lVe 8% lld Blended for minutes at 305-3l0C. No

evidence of decomposition as assessed by color IVf 8% Blended for 5 minutes at' 300-305C.

Compound 6 Decomposition evident by brown color and (U.S. Pat. No. acrid odor of hot metal 3,526,613)

Thermogravimetric analysis of some of the polyester,

flame retardant blends were determined. Weight loss of the blend was measured on heating at 10C per minute in a nitrogen atmosphere. The temperature at which 3, l0 and 50 percent weight losses occurred are shown below:

'71 Flame Retardant Temperature. (I Obncrved for '7' Blend Agent Weight Lomt of None 407 418 440 lVa 8% la 385 410 445 lVe 8% "ti 375 410 440 IV] 8% Compound 6 245 390 435 (U.S. Pat. No. 3,526,6l3)

Pressed sheets were prepared from the melt blends by compression molding at 575F press temperature and 0.07 inch mold cavity. The molded sheets were annealed at 280F for 15 minutes.

Flame properties of the polyester flame retardant compositions were determined according to the American Society for Testing Material, 1) 2863-70. Sample size was 0.07 X 0.5 X 2.5-5.0 inches. Self-adhering glass tape (3M Company, Scotch Brand, glass electrical tape, No. 27; manufactured under US. Pat. No. 3,] 15,246) was applied to one side of the test specimen which prevented bowing during burning.

The effects of flame retardant concentrations other than those in the melt blends listed above were also determined. These samples prepared by dry blending in a mortar and pestle (a) polyester-flame retardant concentrate with unmodified polyester powder or (b) neat flame retardant with unmodified polyester powder. The variation in flame properties with flame retardant concentration is shown in Table IV below:

TABLE IV Flame Retardant Blending Method none 25.8 4% l Concentrate 28.3 8% In Hot melt 31.7 8% la Concentrate 31,7 8% la Neat 31.7 16% la Concentrate 35.8 20% la Concentrate 32.5 24% In Hot melt 33.9 4% lla Concentrate 29.2 8% Ila Concentrate 32.5 8% Ila Neat 30.7 16% [la Concentrate 34.2 20% Ila Concentrate 33.3 24% Ila Concentrate 34.2 8% lld Hot melt 28.3

"LOI-limiting oxygen index. Flame resistance increases with increasing LOI value.

The rapid increase in flame resistance with increasing concentration of flame retardants la and Ila up to about 16 percent is clearly shown. The flame resistance of a given polyester composition was generally independent of the blending technique. The flame properties of polyethylene terephthalate containing 8 percent of other compounds of invention are shown in Table Vll.

RETENTION OF FLAME RETARDANT One gram of finely ground polyester, flame retardant composition was stirred with 200 g. of water containing 1.2g. of nonionic laundry detergent at varied temperature-time intervals to determine extractability of flame retardant. The detergent composition was as follows:

10.0 pts alkylphenoxypoly(ethyleneoxy)ethanol 5.0 pts sodium dodecylbenzene sulfonate 35.0 pts sodium tripolyphosphate 10.0 pts borax 5 .0 pts sodium meta silicate 33.5 pts sodium carbonate Extraction results are shown in Table V.

Excellent resistance to extraction was observed under all conditions except boiling. Twenty hours at C exposure approximates the conditions for 50 cycles of home laundering. The apparent negligible effect of particle size on retention of flame retardant was surprising.

TABLE v Retention of Flame Retardants Effect of Particle Size on Extraction FR Agent Polyester, Average Time, Tempera- Flame Particle Size, hours ture, "C Rammed Retardant microns Composition 1V0 271 4 60 95.4 lVa 127 4 60 92.5 lVa 105 4 60 96.5 [Va 291 4 60 87.8 IVC l 29 4 60 87.5 1V0 l05 4 60 92.6

Effect of Extraction Time at 60C [Va 127 4 60 92.5 [Va 127 60 86.5 lVc 127 4 60 87.5 lVc 127 20 60 88.5

Effect of Extraction Temperature lVa 127 4 60 92.5 IVa 127 4 100 52.4 lVc 127 4 60 87.5 1V6 127 4 100 49.6

Retention based on elemental phosphorus analysis EXAMPLE V Melt blends of polycarboxamide (Nylon 66 type; Vicat softening point of 518F by ASTM D1525) and flame retardants were prepared in a similar manner as described in Example IV. Some discoloration of polymer-flame retardant composition was observed because of localized overheating owing to insufficient stirring of the extremely high melt viscosity at 280-3l0C. Hot melt blends prepared in an injection molder with more uniform temperature and mixing control showed little or no polymer degradation or discoloration.

Test specimen were prepared and flame tested according to the procedure of Example IV. The results are shown in Table VI.

The excellent flame retarding properties shown in I able V1 by the compounds of invention were further demonstrated using a second flame test method. Sheets were prepared as described above from neat flame re- I tardant-Nylon 66 blends at 4 and 8 percent flame retardant levels.

TABLE VI Effect of Flame Retardants on Nylon 66 Properties Flame Retardant Blending Method None 23.3-24.2 8% la concentrate 26.7 16% la concentrate 28.3 24% la concentrate 30.0 8% lb neat 28.0 12% lb neat 31.1 4% lla concentrate 25.8 8% lla concentrate 26.7 16% lla concentrate 27.5 20% lla concentrate 29.2 24% 11a concentrate 29.2

The flame properties of each composition were detennined by the critical angle test according to the procedure described below.

Three or more 0.07 X 0.25 X 2 inches samples were die cut from the pressed sheet. One end of the sample was placed in a single clamp in such a manner that the free end could be ignited with a paper match. Samples of each composition were tested in one or more of the positions as defined below: i

Position Path of Flame Propagation after lgnition of Free End 0 downward and to horizontal 45 downward at 45 to horizontal 90 horizontal upward at 45 to horizontal upward at 90 to horizontal The flame was applied to the free end until ignition of sample was observed (usually about 5 sec.) and removed. If the flame progressed to the clamp, the sample was considered non-self-extinguishing (NSE) in that position. If the sample was self extinguishing before the flame reached the clamp, the flame was applied to a second ignition. 1f the sample was SE before reaching the clamp after the second ignition it was considered SE in that position.

Generally, the first sample of each film composition was tested in the 90 position. If it was found to be NSE at 90, additional samples were tested sequentially in the 45 and 0 positions. If the second sample was SE at 45, this was considered the maximum angle whereby the sample would be found SE and recorded as such. If however, the first sample tested in the 90 position was found to be SE, additional samples were tested sequentially in the 135 and 180 positions. For clarification of flame properties ratings in Table V11, the table below relates flame properties as assessed in individual positions and overall rating.

Positions Tested (Performance) Overall Rating 90 (NSE), 45 (SE) 45 90 (NSE), 45 (NSE), 0 (SE) 0 90 (NSE), 45 (NSE), 0 (NSE) NSE 90 (SE), 135 (SE), 180 (SE) 180 90 (SE), 135 (SE), 180 (NSE) 135 90 (SE), 135 (NSE) 90 It is to be understood that flame resistance varied proportionately to the numerical value assigned for the overall rating (corresponding to the position as defined above).

The flameproperties of Nylon 66, flame retardant compositions are shown in Table VII. Compounds of invention greatly improved the flame resistance of Nylon 66 at concentrations of 4 and 8 percent.

EXAMPLE Vl Phosphorus compounds shown in Tables [-111 were added to a 10 percent solution of acetate rayon in acetone in quantities equal to 4 and 8 percent of the total weight of acetate rayon and phosphorus compound. Films were cast from the resulting solution, air dried for about one hour and conditioned at 73F, 50 percent relative humidity for at least 24 hours before flame testing. Film thickness was approximately 1 mil.

The flame properties of each film was determined according to the critical angle test of Example V except sample preparation. Three or more 0.5 X 2 inch strips were cut from each film composition. The film strip was folded with creasing along the 2 inch axis to form a V shape (end view) whereby each side of the V was approximately 0.25 inch. One end of the test specimen was placed in a clamp. Flame testing and rating was identical to the procedure of Example V. Only l-2 seconds exposure to the flame was required to ignite the thin film sample.

The excellent flame resistance of acetate rayon films containing 8 percent of most compounds of invention is shown in Table VII.

EXAMPLE VII The flame test results are listed in Table VII. Significant improvements in flame properties of both polyacrylonitrile and polystyrene was obtained by most of the compounds of invention at the 16 percent level.

In Table VII, the segment of the structural formulae shown as is used as a shorthand designation of the segment as shown elsewhere in the specification.

TABLE v11 Flame properties of various polymer, flame retardant compositions, flame retardant additive evaluations 8% Flame Retardant Concentration Flame rating in critical angle test Com- A LOl pound poly- Nylon Acetate Iolyacry- Polyo. Structure ester 66 rayon Ionltrile styrere" N additive" 0 45 NSE NSE NEE I 0 Et 0 6.7 iso use 90 45 (71130 1% 0 CH2); (CHzOhI CH4 Ia 0 El; 0 5. 9 1S0 180 0 180 CHai [OCH2( J(CH2O)z CH3]:

Ib Mixture I and Ia. 4.2 ND 180 90 45 Ie 0 Me 0 3. 4 180 135 90 90 CHaI E [OCHzXCHzOh CH3]2 Ig 0 Et 0 4 2 180 NSE 45 45 CHzgCHzCHgCHzi [OCHzJXCHzOhliCHzCHgCHzCHa]:

Ih 0 El 0 5.9 180 180 45 45 (OHgOhi O CHz (CHaOhl t CH3 Ii 0 Et 0 5.9 45 0 45 1&[0 CH:J(CHzO)zi C1-Ia]a I] 0 Et 0 2. 5 180 135 45 45 [O C'Hz (CHzOhi CHgOHz];

Ik 0 Et 0 4. 2 180 135 NSE 45 [0]2OCH2( 3 (CHzO)2l CH3 II O 0 Et 0 1.7 180 ND ND ND 0310001115 omoni cm Ha- 0 Et 0 4. 2 180 135 NSE 45 D-[&O CH2!) (CHzO)zCHa]z 11c 0 Me O 3. 4 180 INS I 0 45 p-[( CHz (GHZO)2 CHa]2 IId. 0 Et 0 4 2 180 NSE 45 He 0 Et 0 0 El; 0 4. 2 180 INS 0 45 CH3; (0 CHM!) CHgO g CH=CH O CHz (CHzOhi CH 0 Et- 0 0 Et CH (OCHzh CHZOJI O CHa (CHaO)2CH TABLE Vl1--Continued 8% Flame Retardant Concentration Com A L01 Flame rating in critical angle test pound pol y- Nylon Acetate Polyacry- Poly- No. Structure ester 66 rayon l r l styrene If i C1 C1 i M 3T mo I Ns 45 INB- Et 0 Et 0 CH3(OCH1)2&CH30&- OCHz(CHzO)gl CH;

l l IIh.-. [0 Et 0 '1 1.7 180 INB NEE INS p- 000m (CHQO): 01120111011 1 Hi 0 Et 0 0 Et 0 4. 2 isc 135 o 45 CHs (0 CHzhCHgO (011044 30 (EH (OHzOhl CH3 Ill 0 E1: 0 3. 4 180 90 0 45 @ll 0 011.6 crawl CHa 11k. 0 Et 0 4. 2 180 90 NBE 45 Br-@-ll 0 011.5 cmonl CH;

I11 El) E1; 0 4. 2 180 45 NSE 45 C 0 01-1243 (CHzOhl CH3 IIm---.. 0 E1, 0 4. 2 180 90 NSE 45 @d 0 011,0 cmonl OH III Et 0 3. 4 180 135 45 45 cH,-@-s 0,0 omc (CHa0):l 'CH3 Et om-@-s 030 cHir (CH2O)2PCHzCHa Flame retardant concentration of 8% unless noted. LOI value over control sample.

Flame retardant concentration of 16%.

Flame retardant at 4% level also gave 180 rating. Not determined.

Insoluble in polymer solution.

EXAMPLE VIII Flexible polyurethane foams were prepared from the recipes as shown below:

Ingredients, parts Formulation Toluene diisocyanate (TDI) 135.4 135.4 135.4 Polyether triol (MW 300 300 300 approx. 3000) Compound 1 0.0 12.9 21.6 Silicone oil surfactant 1.0 1.0 1.0 Stannous octoate 0.9 0.9 0.9 N, N"-Dimethyl 1.2 1.2 1.2 ethanolamine Water 10.6 10.6 10.6

In each case, all ingredients except toluene diisocyanate (80% 2,4-isomer; 20% 2,6-isomer) were blended at room temperature. The diisocyanate was then added, mixed vigorously for about 12 seconds and the mixture was poured into a cardboard box and allowed to foam. After full rise had occcurred, the foam was placed in an oven at 120C for minutes. After removing to crush closed cells by mechanical compression, the foam was heated for an additional 2 hours at C.

The flame properties of the polyurethane compositions were determined by ASTM-D-l692 -59T. Foam density and flame test results are summarized below:

Foam Composition a b 0 Density, lb/ft 1.93 1.87 1.82 SE time, sec* NSE 34 l 1 Total distance burned, in 6 2.51 1.44

Time elapsed after flame reached l-inch mark before flame was self-extinguished.

EXAMPLE IX The polymethylene polyphenylisocyanate used above is a mixture represented by the formula:

Noo [N 1 N00 on, cH=

where n ranges from 0-2 and averages about 0.6.

% Flame Retardant P) Rating by ASTM Total D- l 692'59T Distance Burned, inches None Burning 6.0 4.7% l (l 0% P) Self-extinguishing 0.8l 7.0% l (l P) Non-burning 0.59 4.8% la (1 0% P) Selfextinguishing L3 7.2% la (l.5% P) Non-burning 0.75 8.5% lla (l.0% P) Self-extinguishing 1.75

The above results show the high flame retardant efficacy of compounds of invention, especially Compound I.

The flame retardant addition compounds are effective at flame retardant concentrations in polymers, including polyethylene terephthalate, polycarboxyamide, polyacrylonitrile, acetate rayon, polystyrene, rigid polyurethanes and flexible polyurethanes. They will also be effective in combinations with polymeric materials such as cotton, cellulose, paper and silk; cellulose esters and ethers such as cellulose acetate butyrate and ethyl cellulose; polyvinyl chloride; polymethyl methacrylate; phenol aldehyde resins; alkyd resins, urea resins, epoxy resins; linear and cross-linked polyester; and maleic anhydride heteropolymers. Flame retardant concentrations can vary dependent upon the polymer used. In general, they will be 2 to 30 percent, preferably 4 to 16 percent, based upon the weight of the total composition.

One or more of the addition compounds can be incorporated into the polymer during the polymerization step or by admixing with the polymer prior to or during milling, extrusion, spinning, foaming, pressing or other conventional operations for forming or applying the polymeric end-product.

The physical form of the flame retardant composition can vary widely. While textile fibers are of major interest, films, coatings, sheets, rods, boards, foams and the like can be used. Excellent retention of flame resistance is achieved by distributing the flame retardant throughout polyester. Non-uniform distribution of the flame retardant into a formed polymer such as fibers can also be advantageous.

The flame retardants of this invention may be used in combination with known flame retardants. Compounds have free -CH OH or -CH CHE OH groups may be used in a manner to become an integral part of a poly mer such as polyesters or polyurethanes.

Although the present invention has been described with preferred embodiments, it is to be understood that modifications and variations may be resorted to, without departing from the spirit and scopy of this invention, as those skilled in the art will readily understand. Such modifications and variations are considered to be within the purview and scope of the appended claims.

What is claimed is: 1. Compounds set forth by the formulae:

whereaisOor l;bis0, l or2,cis l, 2, or 3 anda+b+c is 3; R and R are the same or dissimilar and are alkyl (C -C phenyl, halophenyl, hydroxyphenyl, tolyl, xylyl, benzyl, phenethyl, hydroxyethyl, phenoxyethyl, or dibromophenoxyethyl; R is alkyl (C -C and R is lower alkyl (C,-C or hydroxyalkyl (C -C and m o '7 R1 01120 (1 3) i W H (H) R2/CH20\ 7 (ROi? dR (COCH2( J PR CHrO )8 V o 7 6mm and o ll (@0 l OCHz PCH;

3. A compound of claim 1 having the formula:

0 omorri cmo o i l omoi oomci imrr,

CH; CHQO 4. A compound of claim 1 having the formula:

0 omen: c1110 0 ll 5/ \II can 00H, PCHa CHiO 5. A compound of claim, 1 having the formula:

6. A compound of claim l havingthe formula:

CHzO

7 A compound of claim 1 having the formula: 7

O CHaCHg CHIO O showy icm] CHaO 8. A process for preparing addition products that comprises reacting a compound A:

a phosphonate ester having the formula:

wherein R,R', and R are alkyl (C -C hydroxyalkyl (C -C phenyl, halophenyl, hydroxyphenyl, tolyl, xy-

24 lyl, benzyl, phenethyl, phenoxyethyl, or dibromophenoxyethyl, with the proviso that at least one R,R' or R" group is methyl, ethyl, propyl, butyl, or hydroxyethyl; or

a carboxylic acid ester having the formula:

I 5 I Elton),

wherein n is l to 3, R is alkyl (C -C hydroxyalkyl (C -C phenyl, halophenyl, hydroxyphenyl, tolyl, xylyl, benzyl, phenethyl, phenoxyethyl or dibromophenoxyethyl, with the proviso that when n is one, R is methyl, ethyl, or hydroxyethyl and when n is 2 or 3, at least one R is alkyl (C -C or hydroxyalkyl (C -C and R is monovalent alkyl (C -C chlorophenyl, bromophenyl, dibromophenyl, tribromophenyl, hydroxyphenyl, naphthyl, tolyl, xylyl, benzyl, or phenethyl; divalent alkylene (C -C vinylene, o-phenylene, mphenylene, p-phenylene, tetrachlorophenylene (o, m,or p), or te'trabromophenylene (0, m,or p); or trivalent phenenyl;

with a compound B having the formula:

OHIO Z-C-CH20P CHgQ wherein Z is alkyl (C -C at an elevated temperature.

9. The process of claim 8 wherein compound B is lethyl-4-phospha-3,5,8-trioxabicyclo-(2,2,2 )-octane.

10. The process of claim 9 wherein compound A is dimethyl methylphosphonate.

11. The process of claim 9 wherein compound A is trimethyl phosphate.

12. The process of claim 9 wherein compound A is dimethyl terephthalate.

13. The process of claim 9 wherein compound A is dimethyl o-phthalate.

14. The process of claim 9 wherein compound A is diphenyl methyl phosphate. =0:

mg r @EFECE v Htm o CEC'HCN Pstent No. q gqoo Dated Januarv 29. lQ'F l- Inv James J. Anderson, Vasco G. Camacho and Robert E.

Kinney It is certified that error appears in the above-identified patent and that ssid Letters ?stent are hereby corrected as shown below:

. W Column 1, in the line following formula (B), delete "a e is 35'" Column 22, Claim 1, in the line following formula (B) delete "d e is 3;

Signed and sealed this 5th day of ovember 1974-.

(SEAL) Attest:

MCCOY M. GIBSON JR C, MARSHALL DANN Attesting Officer Commissioner of Patents *zgz g'g UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent n 3,7 9, 9 Dated Ja a y 9, 19?

Inventor) JAMES J. ANDERSON,VASCO G. CAMACHO, ROBERT E. KINNEY It is certified that error appears in the above-identified patent and that said Lgrters Patent are hereby corrected as shown below:

Column 3, line 2, after "and" insert P Column 18, Table VII last heading "Polystyrere should be Polystyrene 7 Column 20, line 54, Before "Time" insert Column 2-1, line 15, "to" should be and Signed and sealed this 9th day of July l97h.-

(SEAL) 'Attest:

'MCCOY M. GIBSON,JR. C. MARSHALL DANN Commissioner of Patents Attesting Officer UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Januarv 2Q. lQ'Y L Po-wso (5/69) Penn: No. '-2 78Q QQl Dated James J. Anderson, Vasco G. Camacho and Robert E.

Kinney It 1e certified that error appeere 1n the above-identified patent and the: eeid Lettere Potent ere hereby corrected as shown below:

Inventofll) Column 1, in the line following formula (B) delete "a e is 35'" Column 22, Claim 1, in the line following formula (B) delete "d e is 3;

Signed and sealed this 5th day of ovember 1974.

(SEAL) Attest:

' C. MARSHALL DANN Commissioner of Patents McCOY M. GIBSON JR. Attesting Officer 

2. A compound of claim 1 having the formula:
 3. A compound of claim 1 having the formula:
 4. A compound of claim 1 having the formula:
 5. A compound of claim 1 having the formula:
 6. A compound of claim 1 having the formula:
 7. A compound of claim 1 having the formula:
 8. A process for preparing addition products that comprises reacting a compound A: a phosphonate ester having the formula:
 9. The process of claim 8 wherein compound B is 1-ethyl-4-phospha-3,5,8-trioxabicyclo-(2,2,2)-octane.
 10. The process of claim 9 wherein compound A is dimethyl methylphosphonate.
 11. The process of claim 9 wherein compound A is trimethyl phosphate.
 12. The process of claim 9 wherein compound A is dimethyl terephthalate.
 13. The process of claim 9 wherein compound A is dimethyl o-phthalate.
 14. The process of claim 9 wherein compound A is diphenyl methyl phosphate. 